Bridge displacement detection device and method

The invention provides a bridge displacement detection device and method, relates to the field of bridge detection, and solves the problems that after bridge construction is completed, due to automobiles, pedestrians and natural factors, a bridge plate can be displaced on a bridge pier after long-time use, if the bridge plate is not detected and maintained in time, the bridge collapse is easily caused, and the safety accident of large loss is caused. The problems that in the prior art, no excellent detection technology exists, and if only manual detection is adopted, the efficiency is low, personal safety accidents are likely to happen, and guarantee cannot be provided for the safety of detection personnel are solved. The unmanned vehicle is technically characterized by comprising an unmanned vehicle body; the first supporting structure is installed on the upper surface of the unmanned vehicle body, and the first supporting structure is used for supporting; and the observation structure is installed on the fi